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-rw-r--r--lib/compiler/src/sys_core_fold.erl19
1 files changed, 19 insertions, 0 deletions
diff --git a/lib/compiler/src/sys_core_fold.erl b/lib/compiler/src/sys_core_fold.erl
index cda3f7d81e..6b0ae87172 100644
--- a/lib/compiler/src/sys_core_fold.erl
+++ b/lib/compiler/src/sys_core_fold.erl
@@ -2342,6 +2342,25 @@ move_let_into_expr(#c_let{vars=Lvs0,body=Lbody0}=Let,
Case#c_case{arg=Cexpr,clauses=[Ca,Cb]};
{_,_,_} -> impossible
end;
+move_let_into_expr(#c_let{vars=Lvs0,body=Lbody0}=Let,
+ #c_seq{arg=Sarg0,body=Sbody0}=Seq, Sub0) ->
+ %%
+ %% let <Lvars> = do <Seq-arg>
+ %% <Seq-body>
+ %% in <Let-body>
+ %%
+ %% ==>
+ %%
+ %% do <Seq-arg>
+ %% let <Lvars> = <Seq-body>
+ %% in <Let-body>
+ %%
+ Sarg = body(Sarg0, Sub0),
+ Sbody1 = body(Sbody0, Sub0),
+ {Lvs,Sbody,Sub} = let_substs(Lvs0, Sbody1, Sub0),
+ Lbody = body(Lbody0, Sub),
+ Seq#c_seq{arg=Sarg,body=Let#c_let{vars=Lvs,arg=core_lib:make_values(Sbody),
+ body=Lbody}};
move_let_into_expr(_Let, _Expr, _Sub) -> impossible.
is_failing_clause(#c_clause{body=B}) ->